TORQUE WRENCH - TOHNICHI MFG CO LTD

Title:

TORQUE WRENCH

Document Type and Number:

WIPO Patent Application WO/2010/119598

Kind Code:

A1

Abstract:

Provided is a torque wrench having a cam-type torque detection mechanism capable of detecting torque with high accuracy and allowing users to safely fasten members to be fastened such as bolts with natural handling feel after torque detection. In a torque wrench having a cam-type torque detection mechanism, a cam portion (27) formed at the outer periphery of a cam cylinder (22) includes a static engaging cam surface (27a) with which a roller member (18) at a standstill engages while the roller member (18) is not operating, a torque peak increasing cam surface (27b) that is linked to the static engaging cam surface (27a) and gradually increases the peak value of the torque when the roller member (18) moves while being in contact with the torque peak increasing cam surface (27b), a cam top surface (27c) that is linked to the torque peak increasing cam surface (27b) and forms a cam top portion, a torque reducing cam surface (27d) that gradually reduces the positive torque applied to the roller member (18) to zero, and a negative torque cam surface (27e) that applies negative torque to the roller member (18) after the roller member (18) passes through the torque reducing cam surface (27d).

Inventors:

OGATA TOMOHIRO (JP)
SHIMURA KOICHI (JP)
KATO YUJI (JP)
AIKAWA SHOZO (JP)
TSUJI HIROSHI (JP)

Application Number:

PCT/JP2010/000921

Publication Date:

October 21, 2010

Filing Date:

February 16, 2010

Export Citation:

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Assignee:

TOHNICHI MFG CO LTD (JP)
OGATA TOMOHIRO (JP)
SHIMURA KOICHI (JP)
KATO YUJI (JP)
AIKAWA SHOZO (JP)
TSUJI HIROSHI (JP)

International Classes:

B25B23/157; B25B13/46; B25B23/14

Foreign References:

JP2006515916A	2006-06-08
JPH0740070U	1995-07-18
GB2148767A	1985-06-05

Other References: